angular6 http.service.ts

import { Injectable, isDevMode } from '@angular/core';
import { HttpClient, HttpParams, HttpHeaders } from '@angular/common/http';
import { environment } from '../../environments/environment';
import { Observable } from 'rxjs';

@Injectable()
export class HttpService {
  requestURL =  environment.ApiBase;
  token = sessionStorage.getItem('adal.access.token.key');
  httpOptions: any = {
    headers: new HttpHeaders({
       'Content-Type': 'application/json;charset=utf-8',
       'Authorization': 'Bearer ' + this.token
    })
  };
  constructor(
    private http: HttpClient 
  ) { }

  private urlFactory(resourceKey: string): string {
    return `${this.requestURL}${resourceKey}`;
  }

  private paramsFactory(params: any): HttpParams {
    let para = new HttpParams();
    Object.keys(params).forEach( key => para = para.append(key, params[key]));
    return para;
  }

  get(resourceKey: string, parameters: any): Observable<any> {
    const url = this.urlFactory(resourceKey);
    const params = this.paramsFactory(parameters);
    return this.http.get( url, { headers: this.httpOptions.headers, params: params });
  }

  post(resourceKey: string, body: any): Observable<any> {
    const url = this.urlFactory(resourceKey);
    return this.http.post(url, body, {headers: this.httpOptions.headers});
  }

  put(resourceKey: string, body: any): Observable<any> {
    const url = this.urlFactory(resourceKey);
    return this.http.put(url, body, {headers: this.httpOptions.headers});
  }

  delete( resourceKey: string, parameters: any): Observable<any> {
    const url = this.urlFactory(resourceKey);
    const params = this.paramsFactory(parameters);
    return this.http.delete(url, { headers: this.httpOptions.headers, params: params });
  }
}

 调用部分：

import { Injectable, Type } from '@angular/core';
import { HttpService } from './http.service';

@Injectable()
export class CmapActionsService {

    constructor(private http: HttpService) { }

    public getDropDownList() {
        return this.http.get('DropDown', {});
    }

    public getActionById(id: number, eid: string) {
        return this.http.get('ActionItem/getactionitembyid', { id: id, eid: eid });
    }

    public addAction(action: any) {
        return this.http.post('ActionItem', action);
    }

    public removeAction(actionID: number) {
        return this.http.delete('ActionItem', { actionID: actionID });
    }

}